Start: Grab two dumbbells, a heavy one in your right hand and a light one in your left. (The heavy dumbbell should be about twice the weight of the light one.) Press the light dumbbell over your head, with your arm straight and your biceps in line with your ear. Let the heavy dumbbell hang at arms length next to your side.

Movement: With your core braced and glutes right, walk forward and then backward, and then every which way. Once you have worked for half of your allotted time, switch sides.